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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571382f618a0fb4bb72bf38bf665bb1ae34e4242794859000d7f239eeccfd8e8' 
  AND token = 'VE0k1hSzm9cK26o6h97r7rN+u5xcQailjyPJWo3wd/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}